Microstructure and Temperature Stability of Ca Substituted Forsterite Ceramics

Abstract:

In this paper, the dependance of microstructures on temperature stability of the (Mg_1-xCax)₂SiO₄ (0≤x≤0.5) ceramics prepared by the conventional solid-state route were investigated. The XRD and SEM testing results showed the (Mg_1-xCax)₂SiO₄ ceramics were mainly composed of both forsterite (Mg₂SiO₄) phase and Monticouite (MgCaSiO₄) phase. Significantly, with increasing x, the ceramic temperature coefficients of resonant frequency (τ_f) were strongly correlated to the ceramic crystalline phase compositions and could be adjusted to near zero value through changing the contents of both phases. And its dielectric constants (e_r) were kept in the range of 6.8 to 8.7, and the quality factors (Q×f value) in the range of 18, 080 GHz to 55, 840 GHz at 15GHz.

• Periodical: Applied Mechanics and Materials (Volumes 117-119)
• Pages: 606-609
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.117-119.606
• Online since: October 2011
• Authors: Kai Xin Song, Peng Zheng, Xiao Ping Hu, Jiang Xiang Deng, Jun Wu, Jun Ming Xu, Zhi Hua Ying, Liang Zheng, Hui Bin Qin
• Keywords: (Mg_1-xCa_x)₂SiO₄, Microstructure, Microwave Properties

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